Hanger and hammer assembly for hammer mills



Sept. 18, 1951 Filed Dec. 17, 1948 Patented Sept. 18, 1951 HANGER AND HAM HAMMER MER ASSEMBLY FOR MILLS- George Alexander Millard, New London, Wis.

Application December 17, 1948, Serial No. 65,877 Claims. (01. 241-197) This invention relates to hammer mills and more particularly to a novel mode of assembling the hangers and hammers.

It is an object of my invention to provide a simple and rugged structure whereby hammers may be easily and rapidly'joined to their respective hangers.

It is another object of my invention to provide a hanger and hammer assembly suitable for incorporation in any type of hammer mill.

It is a further object of my invention to provide a structure which'may be used either as an end crushing hammer or a side crushing hammer.

It is a further object of my invention to provide a hanger and hammer assembly wherein the hammer may be reversed.

In general my invention contemplates, hangers having a novel shape comprising protuberances for engaging correspondingly-shaped channels in the hammer with which they are associated. The particularly novel feature resides in having the hangers enter the hammer at the side thereof, although the invention is adaptable for entrance at the ends of th hammer also.

My invention will now be described in conjunction with the appended drawing, in which,

Figure 1 is a section through a portion of a mill showing a side view of one of my hangers and the respective hammer;

Figure 2 is a section through 2--2 of Figure 1;

Figure 3 is a front view of another form, shown looking toward a side of the hammer;

Figure 4 is a section through 4-4 of Figure 3;

Figure 5 is a section through 5-5 of Figure 3;

Figure 6 shows a view of another modification of my invention;

Figure '7 is a horizontal section taken through Figure 6;

Figure 8 is a section through 8-8 of Figure 6;

Figure 9 is an end elevational view of the hammer illustrated in Figures 3 to 5, inclusive; and

Figure 10 is a similar end elevational view of the hammer illustrated in Figures 6 to 8.

With reference to Figures 1 and 2, my invention comprises L-shaped hangers l0 arranged to engage in the ends of a hammer l4, and including substantially vertical arms 2| and substantially horizontal arms Hangers H] are pivotally suspended in the usual manner from discs 11 of a hammer mill. At the outer end of each hanger arm 20' an elongated transverse head 20 is formed of the material thereof in a direction generally parallel to the main arm 2|. These heads 20 are inserted in correspondingly shaped openings or slots 23 in the hammer ends, as will be understood from consideration of the drawing.

It will be apparent from the above description that the hammer i4 is suspended at its ends by means'of the hangers ID in a simple but very rugged manner, it being noted that each hanger It] has a toe extension 22 extended beyond the head 20 to the outer side of the respective hammer [4. Thus considerable bearing area is provided for suspension of the hammer at each end thereof. The arms 20' and toe extensions 22 engage in transverse slots 23", formed in th opposite ends of the hammer l4 and extending at right angles to and intersecting the openings 23, as shown.

The particular shape of the head 20, as shown in Figures 1 and 2, may be varied as a matter of design; e. g. they could be circular, diamondshaped, square or rectangular, etc. and need not necessarily be symmetrical with respect to the axis of toe 22'.

The discs I! are keyed at to a drive shaft 46, and each pair of hangers I0 is pivotally mounted upon a pin 41 extending through openings 48 in the discs. Upon each pin 41 is mounted a spacer sleeve 49 of such length as to engage the side faces of the two inside discs H. A cotter pin 59 is inserted through openings in the sleeve 49 and the pin 41 to restrain the pin from relative displacement with respect to the discs [1.

Removal of the cotter pin 50 permits the pin 41 to be detached from the discs l1, thereby providing an arrangement wherein the hangers Ill may be easily connected with or detached from the discs l1. Since the hangers ID are each located between two discs H, the hangers are restrained from relative movement longitudinally of their associated pins 41. Thus the hammer I4 is efiectively connected with its associated hangers 10 so that the hammer is restrained from relative movement with respect to the hangers, but with the construction such as to facilitate detachment of the hammer from the hangers through disconnection of the hangers from the discs.

While the form just described issuitable for suspending hammers at their ends, it will be appreciated that the nature of my invention is such as to make it readily adaptable for suspending hammers by engaging them at their sides. There are certain advantages to be gained thereby, namely, the fact that a narrower hammer can be used, narrow hammers being self-sharpening with use. Further, side suspension results in a generally stronger structure than end suspension. Thus in the form of my invention, as shown in Figures 3, 4 and 5, I provide a longitudinal slot ble to provide sets of hammers of 23 substantially centrally of a hammer 24 and of sufficient length as to accommodate the vertical height of the heads 20. Accordingly, the hangers and hammers are readily assembled by thrusting the heads 20 into slot 23, substantially centrally thereof, and then sliding the hangers toward the opposite ends of the hammer 24, wherein the heads engage in elongated end pen ings or channels 21 for locking engagement. I prefer to contour the openings 27 to match the contours of the heads 20, although matching is not absolutely essential. The slot 23 has end reduced extensions 23, extending at right angles to and intersecting the elongated openings 21. The openings 2! may extend through the opposite ends of the hammer 2 3-, as shown at 30. slot extensions 23 receive the arms 26 and toe extensions 22 therein, when the heads 20 engage in the inner ends of the elongated openings 27, Figures 4 and 5.

It will be appreciated that channels 2! are suitably spaced so as to provide balanced suspension points for the respective hammer. Although the ends of the hammer may be left open as indicated at 30, it will be appreciated the hanger-hammer assembly joints are protected from abrasive or percussion action dueto contact with materials in the mill.

In another form of my invention, as shown in Figures 6, '7 and 8, hanger entrance into the side of the hammer is likewise utilized. This modificat1on, however. is provided with a hammer 33 having a longitudinal slot and elongated end openings or channels 3'! extending from the ends thereof into slot 35. Hangers so are provided with laterally extending heads :3 for engagement with channels 3.7, and it will be appreciated that the same shape in transverse cross-section of the heads may be used as disclosed in Figure 1 ifdesired, it being noted, however, that such heads do not extend vertically above or below the toe of the hanger but are in effect lateral toe extensions formed at right angles thereto. This particular construction is exceedingly rugged and it will be noted that the main body portion of the hangers, being spaced inwardly from the ends of the hammer, is protected from abrasive and percussion action in the mill.

The constructions which I have shown are all suitable for DIOVldll'lg reversal of their respective hammers, as desired. Further, owing to the novel mode of assemblage disclos d hereinabove, the hangers and hammers may be so rapidly assembled or .dissembled that it would be entirely feasivarying length so that progressively shorter hangers could be substituted for each other as the material of the hammers is worn away with use.

slots and extending beyond the opposite sides of openings and slots being of substan- The tially the same depth and having their bottoms terminating longitudinally inwardly of the opposite ends of the hammer bar, and a pair of L-shaped hangers disposed adjacent to the opposite ends of the hammer bar and supporting the hammer bar and includin arms which extend transversely of the hammer bar and engage within the slots at the opposite ends of the hammer bar, the arms including transverse elongated heads WhlCh extend substantially at right angles of a width substantially equal to the depth of the slots and openings so that the arms and heads are disposed substantially flush with the opposite ends of the hammer bar.

2. In a hammer mill, an elongated hammer bar provided near its longitudinal center with an elongated longitudinally extending slot, the slot extending transversely through opposite sides tively narrow slot extensions leading into the opposite ends of the slot and disposed laterally inwardly of the opposite sides of the slot and extending through the opposite sides of the hammer bar, the hammer bar being provided in its opposite ends with transversely elongated longitugage within the relatively narrow slot extensions and the elongated heads engage within the inner ends of the transversely elongated longitudinal openings.

3. In a hammer mill, an elongated hammer bar provided between its ends and near its longitudinal center with a wide transverse ing therethrough, the hammer bar being provided tensions, the opposite sides of the transversely elongated longitudinal openings being substantially flush with the opposite sides of the slot, and a pair of L-shaped hangers supporting the hamslot extenddirection substantially within the slot extensions while the heads engage within the transversely elongated longitudinal openings, whereby the inner sides of the arms and heads are substantially flush with the opposite ends of the slot.

4. In a hammer mill, an elongated hammer bar provided near its longitudinal center with an elongated slot which extends longtudinally of the hammer bar and transversely entirely through the same, the hammer bar being provided in its opposite ends with aligned longitudinal openings leading into the opposite ends of the slot and being transversely elongated in a at right angles to the sides of the slot, and a pair of hangers supporting the hammer bar and including arms provided at their ends with transverse heads, the arms and heads being insertable' into 'the slot and shiftable toward the opposite ends of the slot so that the heads may engage within the longitudinal openings for detachably locking the hammer bar to the hangers.

5. In a hammer mill, an elongated hammer bar provided near its longitudinal center with an elongated longitudinally extending slot, the slot extending transversely of the hammer bar and through opposite sides of the same, the hammer bar being provided in its opposite ends with aligned longitudinal openings which are transversely elongated in a direction substantially at right angles to the opposite sides of the slot, and a pair of hangers supporting the hammer bar and including arm's provided at their free ends with transverse heads which project laterally beyond the outer sides of the arms, said heads being transversely elongated in a direction substantially at right angles to the arms and being of substantially the same shape in transverse cross-section as the longitudinal openings of the hammer bar, the arms and heads being insertable into the slot of the hammer bar and shiftable longitudinally toward the opposite ends of the slot so that the heads may engage within the longitudinal openings for detachably securing the hammer bar to the hangers.

GEORGE ALEXANDER MILLERD.

REFERENCES CITED The following references are of record in'the file of this patent:

UNITED STATES PATENTS 

